首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   1700013篇
  免费   124020篇
  国内免费   3800篇
耳鼻咽喉   21759篇
儿科学   55708篇
妇产科学   46233篇
基础医学   241926篇
口腔科学   48781篇
临床医学   151869篇
内科学   334736篇
皮肤病学   38777篇
神经病学   131573篇
特种医学   64121篇
外国民族医学   243篇
外科学   257990篇
综合类   38952篇
现状与发展   4篇
一般理论   534篇
预防医学   124407篇
眼科学   40245篇
药学   123907篇
  7篇
中国医学   4480篇
肿瘤学   101581篇
  2021年   13045篇
  2019年   13731篇
  2018年   20196篇
  2017年   15354篇
  2016年   16799篇
  2015年   19154篇
  2014年   26478篇
  2013年   38247篇
  2012年   53177篇
  2011年   55801篇
  2010年   33018篇
  2009年   30891篇
  2008年   51791篇
  2007年   55031篇
  2006年   55466篇
  2005年   52738篇
  2004年   50917篇
  2003年   48286篇
  2002年   46496篇
  2001年   91816篇
  2000年   93632篇
  1999年   76996篇
  1998年   19736篇
  1997年   17285篇
  1996年   17399篇
  1995年   16752篇
  1994年   15294篇
  1993年   14082篇
  1992年   57403篇
  1991年   55294篇
  1990年   52999篇
  1989年   50765篇
  1988年   46144篇
  1987年   44957篇
  1986年   42242篇
  1985年   40003篇
  1984年   29357篇
  1983年   24913篇
  1982年   13900篇
  1979年   25533篇
  1978年   17575篇
  1977年   14907篇
  1976年   13877篇
  1975年   14565篇
  1974年   17632篇
  1973年   16944篇
  1972年   15674篇
  1971年   14453篇
  1970年   13433篇
  1969年   12517篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
992.
993.
Others have reported that spinal cord transection non-uniformly affects the activities of the cardiac, renal and splenic nerves. We were unable to confirm this finding while recording the wide band (1-1000 Hz) discharges of these sympathetic nerves in baroreceptor-denervated, chloralose-anesthetized cats. Most of the power in nerve discharges was below 6 Hz. There was high coherence between the low frequency discharges of different nerves, and power below 15 Hz was essentially eliminated by spinal transection. Evidence is presented that the disparities between this and past studies are, in part, due to the use of a 30-Hz high-pass filter in the earlier studies.  相似文献   
994.
The Executive Nurse Council was challenged to develop strategies designed to empower staff nurses and nurse managers and create opportunities for professional growth. Implementation of these strategies resulted in broad-sweeping changes in roles and functions of groups and individuals at all levels of the organization. The authors describe a support role, administrative nurse specialist, designed to support staff and managers striving to actualize changes in a shared governance framework.  相似文献   
995.
Coexistent primary hyperparathyroidism and monoclonal gammopathy, although rare, has been reported previously by a number of investigators. We report four patients with such an occurrence who were seen between 1976 and 1988. Another patient with primary hyperparathyroidism also had multiple myeloma and was in remission for 12 years. These patients represent approximately 1% of the 386 patients with primary hyperparathyroidism seen during the same 12-year period. Although several mechanisms have been proposed to explain this concurrence, we believe it is the result of a chance occurrence. A review of the literature, an estimate of the chance occurrence of coincidental monoclonal gammopathy, benign or malignant, in patients with primary hyperparathyroidism, and some practical implications of this interesting coexistence are presented.  相似文献   
996.
Data obtained on a sample of persons with mild to profound degrees of mental retardation (N = 8255) and ranging from birth to 98 years of age were factor analyzed to provide information on the structure of maladaptive behavior relative to age and degree of mental retardation. Using the Problem Behavior scales of the Inventory for Client and Agency Planning, two principal factors emerged for children with mild to profound degrees of retardation: Internalized Maladaptive and Externalized Maladaptive. For adolescents and young adults, a three-factor solution which varied by degree of retardation was most appropriate. For middle and older adults, three- and four-factor solutions were identified across all ages and degrees of retardation. Across all samples as many as six different types of dimensions were identified, indicating that the structure of maladaptive behavior may well be influenced by age and level of mental retardation.  相似文献   
997.
998.
A rare case of a maxillo-mandibular band in a 21 year female patient is reported. Possibility of its being a remnant of buccaphary geal membrane is discussed in the light of clinical and histological findings.  相似文献   
999.
1000.
Clinical and laboratory indications of hemocoagulatory disorders (according to the data of electrocoagulograph H-334 and red blood cell deformability) were compared for multiple myeloma patients. They received drugs according to 3 different polychemotherapy schemes involving various combinations and doses of cyclophosphamide, vincristine, rubomycin, paphencyl, sarcolysin and prednisolone. Pretreatment measurements in relevant patients revealed severe hemocoagulative and rheologic shifts responsible for hemorrhages, impaired microcirculation and cardiac failure. The most efficient polychemotherapy was found that gained benefit with addition of plasmapheresis. To control the effect of polychemotherapy, its intensity, individual deviations and duration, it is advisable to combine routine tests with citrated plasma electrocoagulography, assessment of AT-III activity and red blood cell deformability indicating hemocoagulative and rheologic disorders.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号